+ = 1- = 1.25× = - =
0.9+99×0.9= 0÷ = 1÷ = -0.5=
0.6×101= 3.2×2.5×12.5=
6.12+0.7﹣1.12= 10﹣﹣= 23=
1÷1%= 1.5π≈ 0.5××2×=